Added proguard config for SDK

Updated build.gradle from the SDK to correct use proguard file from a AAR library

Adjusted build.gradle sample app to use the thumb proguard file

Added proguard config for SDK, added thumb config for sample project

Updated build.gradle from the SDK to correct use proguard file from a AAR library

Adjusted build.gradle sample app to use the thumb proguard file

Added proguard config for SDK, added thumb config for sample project

Updated build.gradle from the SDK to correct use proguard file from a AAR library

Adjusted build.gradle sample app to use the thumb proguard file

android/java/MapboxGLAndroidSDK/build.gradle

@@ -65,9 +65,8 @@ android {
         }
 
         release {
-            minifyEnabled false
             jniDebuggable false
-            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
+            consumerProguardFiles 'proguard-rules.pro'
         }
     }
 }

android/java/MapboxGLAndroidSDK/proguard-rules.pro

@@ -0,0 +1,24 @@
+# By default, the flags in this file are appended to flags specified
+# in ../sdk/tools/proguard/proguard-android.txt,
+# contents of this file will be appended into proguard-android.txt
+
+# Square okio, ignoring warnings,
+# see https://github.com/square/okio/issues/60
+-dontwarn okio.**
+
+# Package: annotations
+-keep class com.mapbox.mapboxgl.annotations.** { *; }
+
+# Package: geometry
+-keep class com.mapbox.mapboxgl.geometry.** { *; }
+
+# Package: http
+-keep class com.mapbox.mapboxgl.http.** { *; }
+
+# Package views
+-keep class com.mapbox.mapboxgl.views.MapView**
+-keep class com.mapbox.mapboxgl.views.NativeMapView**
+-keepclassmembers class com.mapbox.mapboxgl.views.NativeMapView** {
+    *;
+}
+